Ferve F-2507 Instruction Manual - page 16
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Connect the FERVE F-2507 charger to a mains supply
(D).
Press the MODE button until only the LED POWER is
on.
Connect the clamps to the battery in the following
order: first the red clamp to the positive terminal + (A)
and then the black clamp to the negative terminal - (B).
Finally, connect the clamps to the charger (C).
If the clamps are reversed, the LED warning light
will turn on. Before continuing the charging process,
switch the position of the clamps.